1.4 Tsunamis

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1.4 Tsunamis

Page 14 and 15 of the textbook.

Recap volcanos

Check homework

Instruction
Quiz 1.1 - 1.4

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Volcano La Palma

Hotspot volcanos

Volcanoes in the ocean

Volcanos in the ocean:

•  two parts of ocean floor move apart
•  crack in the Earth’s crust
•  filled with hot rock (lava)
•  lava comes into contact with water
•  lava solidifies
•  a new piece of ocean floor is formed
•  mid-oceanic ridge = sort of stretched out mountain range along the ocean floor

Did you manage to do the homework?

Page 12 of the workbook (or 1.3 online): 3, 4 and 6.

What do you know about tsunamis?

How do tsunamis form?

(1) Earthquake on ocean floor > oceanic plate gives water a push > wave movement in seawater

(2) Wave approaches shallow coastal area > wave shoaling occurs > wave increases in height > suction at the front of the wave > water recedes from coastline

(3) Super wave reaches coast > extremely powerful, high and devastating wave > wave with the same force goes back to sea > devastating suction effect

Consequences

Why is a tsunami so destructive?

• wave moves extremely fast, therefore no time to flee
• tidal wave so strong that it destroys everything in its path
• due to damage escape routes blocked

Rich and poor

Why are the consequences of a tsunami less severe in rich countries than poor countries?

• rich countries have a better warning system
• rich countries can build stronger dykes
• in rich countries the buildings are more strongly built
• due to better transport systems people can escape more quickly

Complete the sentence

The tidal wave (=vloedgolf)/tsunami only becomes high in a ... coastal zone, because the water is ... and the trailing (=achterblijvend) water catches up along the ...

Complete the sentence

The tidal wave (=vloedgolf)/tsunami only becomes high in a shallow (=ondiep) coastal zone, because the water is slowed down and the trailing (=achterblijvend) water catches up along the top.

Complete the sentence

A tsunami has fewer consequences for the citizens of a rich
country than for citizens of a poor country, because ...

Complete the sentence

A tsunami has fewer consequences for the citizens of a rich
country than for citizens of a poor country, because rich countries can pay for warning systems and
warn people faster in case of an approaching
tsunami.

Volcanos

Which three things come out of a volcano?

Plate tectonics

?

?

?

?

Plate tectonics

Convergent

Convergent

Divergent

Transform

How are earthquakes connected to plate tectonics?

Epicentre

The earthquake is most powerful right above the place where the ocean floor was jammed. That is called the ...?

The Richter Scale goes from

1. 1-12
2. 1-10
3. 2-12
4. 5-10

How do you call the movement of the tough rock within the Earth's mantle?

1. Currents
2. Magma currents
3. Plate tectonics
4. Convection currents

Next week

Small test about 1.1, 1.2, 1.3 + 1,4

Homework: study for the test

One piece of Earth's crust please